using get_post_meta() inside functions.php does not work why?…

Hello,

I am trying to read out a value from a custom field inside the functions php.
The code worked fine in the index.php but stopped working when I tried to put it in the functions php. To my surprise “echo get_post_meta($post->ID, ‘link’, true);” did not return a value. So I am wondering if the use of get_post_meta() is possible inside a function. If there are other ways to find out if there is a custom field inside a function please let me know.

Thanks,

This is what I have so far in functions.php with custom field id name ‘link’…

<?php

function s_the_title(){
$var = get_post_meta($post->ID, 'link', true);
if ($var == '')
{
$field_value = get_permalink();
} else {
$field_value = $var;
}
//
	echo '<a href="';
	echo $field_value;
	echo '" rel="bookmark" title="Find out more about '; the_title();
	echo '">';
	echo the_title();
	echo '</a>';
}
?>